Positive electrode and non-aqueous electrolyte secondary battery

Abstract

The present disclosure provides a positive electrode including a positive electrode composite material layer, wherein the positive electrode composite material layer includes an active material particle and a carbon nanotube, a content of the carbon nanotube is 0.45 wt % or less based on 100 wt % of a total solid content of the positive electrode composite material layer as a reference, and a composite material layer area resistivity of the positive electrode composite material layer is 0.10 Ω·cm 2 or more. According to the present disclosure, there are provided: the positive electrode that is excellent in charging/discharging efficiency and that can exhibit a high capacity and a high fusing/disconnection property; and a battery including the positive electrode.

What is claimed is: 
     
         1 . A positive electrode comprising a positive electrode composite material layer, wherein
 the positive electrode composite material layer includes an active material particle and a carbon nanotube,   a content of the carbon nanotube is 0.45 wt % or less based on 100 wt % of a total solid content of the positive electrode composite material layer as a reference, and   a composite material layer area resistivity of the positive electrode composite material layer is 0.10 Ω·cm 2  or more.   
     
     
         2 . The positive electrode according to  claim 1 , wherein the content of the carbon nanotube is 0.15 wt % or more. 
     
     
         3 . The positive electrode according to  claim 1 , wherein the composite material layer area resistivity is less than 0.45 Ω·cm 2 . 
     
     
         4 . The positive electrode according to  claim 1 , wherein a composite material packing density of the positive electrode composite material layer is 3.5 g/cm 3  or more. 
     
     
         5 . The positive electrode according to  claim 1 , wherein a Ni ratio of the active material particle is 60% or less. 
     
     
         6 . The positive electrode according to  claim 1 , wherein the active material particle includes a large particle and a small particle. 
     
     
         7 . The positive electrode according to  claim 6 , wherein an average particle size of the large particle is 12 to 20 μm. 
     
     
         8 . The positive electrode according to  claim 6 , wherein an average particle size of the small particle is 2 to 6 μm. 
     
     
         9 . The positive electrode according to  claim 6 , wherein a ratio of an average particle size of the small particle to an average particle size of the large particle is 1/10 to ½. 
     
     
         10 . The positive electrode according to  claim 1 , wherein the carbon nanotube includes a surface-modified carbon nanotube. 
     
     
         11 . The positive electrode according to  claim 1 , wherein the positive electrode composite material layer further includes an additive agent. 
     
     
         12 . A non-aqueous electrolyte secondary battery comprising the positive electrode according to  claim 1 .